Refrigeration – Processes – Defrosting or frost inhibiting
Reexamination Certificate
2006-12-28
2010-11-23
Jules, Frantz F (Department: 3744)
Refrigeration
Processes
Defrosting or frost inhibiting
C062S129000, C062S151000, C062S155000, C062S140000, C062S180000, C062S226000, C062S234000
Reexamination Certificate
active
07836707
ABSTRACT:
A method to detect and respond to a coil condition in an HVAC system. The method includes calculating an initial airflow restriction value and a current airflow restriction value, which are compared. If the current airflow restriction value is greater than a first sum including the initial airflow restriction value and a first restriction factor, then a coil condition is preliminarily determined to be freezing and cooling in the HVAC system is stopped.
REFERENCES:
patent: 4831833 (1989-05-01), Duenes et al.
patent: 5170635 (1992-12-01), Wruck et al.
patent: 5463875 (1995-11-01), Shavit
patent: 2006/0130497 (2006-06-01), Kang et al.
“Establishing Cooling Requirements: Air Flow vs Pressure” www.comairrotron.com/engineering—notes—02.asp. Dated May 15, 2004.
Puranen Chris
Shah Rajendra K.
Cantor & Colburn LLP
Carrier Corporation
Jules Frantz F
Ruby Travis
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